Question

The following table lists the speed of sound in various materials. Use this table to answer the question.

Answer 1

Answer:

4.9sec

Explanation:

Answer 2

Answer: Time taken by a sound impulse to travel through an aluminum rod 25 kilometers long is 4.9 seconds.

Solution:

Length of aluminium rod = 25 km = 25000 m (1 km=1000 m)

Time taken by sound to travel through aluminium = 5100 m/s (from the table given)

$speed=\frac{distance}{time}=\frac{25000 m}{\text{time taken}}$

time taken =$\frac{distance}{speed}=\frac{25000 m}{5100 m/s}=4.9019 seconds\approx 4.9 seconds$

Hence, the correct option is 4.9 seconds.